| abstract |
The invention discloses a phenyl-substituted five-membered heterocyclic compound of an immune checkpoint inhibitor capable of blocking PD-1/PD-L1 signaling pathway, and a preparation method, use and pharmaceutical composition thereof, and the compound is represented by the following formula I shown, the phenyl-substituted five-membered heterocyclic compounds of the present invention or their pharmaceutically acceptable salts, racemates, optical isomers or solvates. |